Which document established these procedures for the admission of new states?

The Admission to the Union Clause of the United States Constitution, often called the New States Clause, found at Article IV, Section 3, Clause 1, authorizes the Congress to admit new states into the United States beyond the thirteen already in existence at the time the Constitution went into effect.

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(e) a major consequence of the election was that several southern states

a agree i agree becuase it is very importnat for example it can tlel you about your past for exmaple   the first culture was the semerians which people are sitll tryignt o uncover there secrets the wall is just anohter treasure that has thousnads of secrets in it to be uncovered